Image forming method, image formng apparatus, intermediate transfer body, method of modifying surface of intermediate transfer body
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I. First Embodiment
[0084] 1. Outline of Image Forming Device
[0085]FIG. 1 is a schematic diagram showing an outline configuration of an image forming apparatus according to one embodiment of this invention. In FIG. 1, reference number 1 denotes an intermediate transfer body which is driven to rotate about an axis 1A in a direction of arrow F and has a surface layer 2 with good releasability. In FIG. 1, reference number 3 represents an energy application device that performs surface modifying processing on the surface layer 2. In the device shown in FIG. 1, application devices 4, 5 are put in contact with the surface of the intermediate transfer body 1 between the energy application device 3 and an ink jet printing unit 6 to apply a wettability improvement component and an ink viscosity increasing component to the surface. Although the application device 4 for applying a wettability improvement component such as surface active agent and the application device 5 for applying an ink v...
Example
[0150] 3. Example Embodiments
[0151] Next, some embodiments and examples for comparison will be explained in detail for each printing process. In the description that follows, “part” and “%” are expressed in mass terms unless otherwise specifically stated.
Example
Embodiment 1
[0152] (a) Surface Modification of Transfer Body
[0153] As an intermediate transfer body this embodiment used an aluminum drum coated with silicone rubber with a hardness of 40 degrees (KE12 of Shinetsu Kagaku make) to a thickness of 0.2 mm. First, the surface of the intermediate transfer body was modified under the following conditions by using an atmospheric pressure plasma processor 3 (ST-7000 of Keyence make).
[0154] Irradiation distance: 5 mm
[0155] Plasma mode: High
[0156] Processing rate: 100 mm / sec
[0157] (b) Application of Ink Viscosity Increasing Component
[0158] Next, the intermediate transfer body whose surface was modified was coated with an ink viscosity increasing component using a roll coater. As the ink viscosity increasing component, a 10% by mass aluminum chloride hexahydrate solution in water was used.
[0159] (c) Forming of Image on Intermediate Transfer Body
[0160] Next, the ink jet printing unit (nozzle density: 1200 dpi (dots / inch), ejection volum...
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